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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20ef88fbb965eeb8cd3e4afeda15970ddf9a650b310af174ddb3dc92bb228bd9' 
  AND token = 'gT/vg+NkxbJGAHB7jDgWAu4I/6WmDIxmF33/3Tw0tk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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