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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f717ba22a11e8143611b7aa829078354938bd59c5d0a32e5ed7ccbce14a53e0' 
  AND token = 'iI9P7EPQdEgVQnsXXa96sNel/eODYR2bfSStCA6++A4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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