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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd50871ef90cdc93cb20011423d32e07857ab3cbc4c059b854bb727ea9568ed7' 
  AND token = 'i1LLdBFAdXxscj1UcrN+6tR4b1smcNHswd799dfvGU0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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