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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6239cf0aa0bd14a5af5e349e37736938a94b898f07253070b86e07e84311d7ec' 
  AND token = 'lEOX79xjgcd/kiUmI+HAWuBstgggQ4gN3CJmrq14X98=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}