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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a44c7289e038cd1083051c630b353d8c6524ba855ecbad32b01014bd42bba8c' 
  AND token = 'N/op0bJP8QrIxT3tS6ofifYgeLpj2SFWRQeAAmr/qhk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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