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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '790dc4f2206ae1580c1ea85af6b74686aaf33ade7167d218eff63257cdd83be4' 
  AND token = 'nV4P9VsTr43znjA+wLMmktDwzaQ2ynohWZ1/DdT1k00=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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