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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32d12fc9100c112f02b58e77fddfa720f9de2fda89599b3e8d20930ef06a9513' 
  AND token = 'NqhYwfTfXpHC6fvfVjnVGyhzvDIFbKOlCDQUwNTyaO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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