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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a007b6b5e0fe928bb82fc71c5edca76a0a5a84b0074cd48dd009b840154c0597' 
  AND token = 'T+/vqPZLmlixpIKm3EoKeWMyKKCLo2C0rHG8aVfSUFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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