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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f0034957d53b1df6969f2214b62e43b439d2928b8611e9051f950adf8d6aebc' 
  AND token = 'u3tT3evLwCycSAID1f5DESoG2nOz1NZrj10QkRx67Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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