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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8cb505b02d9e49fbb91c7f63aecd796d14ddcc644c884b75f64c3edea842d400' 
  AND token = 'i/vHrN/tbf92/uBEVNKkEG7CSAMULiPJ6yZTdgQFunE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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