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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9258f9c2cd751afa57621f4608dc4664ab7a1d01aa3d818e55829245e3888201' 
  AND token = 'z0xi5g1Mux1zR8l4mSbOAb3VtzG8+ZTiZuwGJfqqQ8I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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