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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec3000416aea2ae2bbf4795947e4854b11af0747437c943d898bb2fdc8aa7764' 
  AND token = 'syL8nvXJHv0s8Bf3kLjApekkQRPztLVThoNL75Hv40A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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