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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ac297d9fd5ae48a9f87c88ef0b19a037f4a3c7c5e62bd45f6c04ea4593425cd' 
  AND token = 'rf0LUujM8nWycwseGxNaG8IlO41d4GCXXDXlWY5PSfY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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