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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6944e76cf656251324e004655bb9eebe2452b12a8fdc9fa1ddd65007d7cbe36' 
  AND token = 'Fr45O20pzxDkUlS4P+oxylauhQGLd+4x1Qn/m0Queck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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