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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa68a567011bf6e72c2618af7ede6d392549a4c6cd93c81195e99a2c1951264d' 
  AND token = 'w6FC4O7yv5dp3tHdwaTLhhSYj/k4aYEX1gC2h8vfL/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00090

JSON explain

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