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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8909205a4b73664ff08aa59771a2fb0b7e389ffd401a2f5bf5d884f18bbc996' 
  AND token = 'vO715Y8oY/Jw+wLttsg0CG2hr0KTpkcJpkxC82S/oho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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