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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4cbb2bcabb9c98f27cc08f3fcdcf1b5cb1dc3442703307b6a4d3b6d1e5f8eba1' 
  AND token = 'Fp8go8iTyy08Mug5eMKOtJRNVtc9N4R0x5OqpbUrkpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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