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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3df40ce7ea9f96897e7dd8960607e1e637a48a7d387886f2254024e12cf4d20e' 
  AND token = 'O5XpiXL8xrouAdwJ/CNfOvKiabZ3JebWZ3Fp+UGlOfM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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