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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b6f037b96a0c4b5792d41902f7738cf5b5ea648308d704ea5ad56d4e7645800' 
  AND token = 'WqTBcjiHFS4PtbWISTYgJ21QochG0Vs62vaKkO5p7hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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