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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b5d102cc4b4473713d1a239360c88e8d5a41cfdb75942a5d546a3394c6b37fb0' 
  AND token = 'EGrY8qftjuRRaNSJy/JM8QMgUQ75eRDcvQT+K+SjETM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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