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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e922a54f25bf82930fece277f4d7aa5a81d48ffac0600ca87b222e6a1ecfc4b6' 
  AND token = '1R+Qtwp0I1h41cyMdWUDvRDkegmDCHpYfnw5R7ewBB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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