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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50ceda01078aa080df679f98d7aeddf03d34eb206f633889765f957b987a98fa' 
  AND token = 'i4pm6/JUbDRW0Qzo9Bg0KUu8Bc4gt4LpRAk6r2X3yYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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