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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b53463969caaa03f444c9c0abe928672697444d6d09b0eeb1d6d3eff8937277c' 
  AND token = 'JceRHDN3hgxEvOBFPPwBsRPgCWjkFdBT7iOoGA5AAiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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