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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e027c8dacb6528c9ae4fb2b3a47f2708b2c4dc3d4b3327b1d153aad550aa8a9' 
  AND token = '5ec9qHXMXzuXKrzLGDh1PS6o2LkPGcghE8NtCUtBN8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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