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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2544861fe9ca7461b0e08fd0bf17335d1158071e5df73a893c850e691d9215a' 
  AND token = 'jT7qHe2AtF+ELp/FLx1h1WASCm23U696agTpOsR24E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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