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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a71f7ba64814d71ba61930c0859f308e84ed7fbbe08dc243a14b0b8edb5975de' 
  AND token = '4cSlZ/f+hw+ctX4t5JG4MNDuEqkE/alADuobc/VywRY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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