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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292f4bdce5b5717f8ee9d1cfa32ce7abbd3de10e32d422b4f26a9bb9f4c022b3' 
  AND token = '7qNf5gGMIuUyj7PKdMkb/eFeLZ5BkEQSHzOgLUq+Joo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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