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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba03458992ee91816e66e8087cdad5a6efb40144454c48564299afccdbb2bb6e' 
  AND token = '1Cu9BuGb/esA0tyDp8+ZLe693iI02E2tzoxXNnSpr34=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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