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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '743b4201c79fc43b1659388ab93979290177de7e8fc93f06e036c1534da65e57' 
  AND token = 'NH4LPeepQ6YVDGvLns8fQVrRijcNZPPTJoA1YqL9FMU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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