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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b72eeff2c1e20a5771256e387d72b56e3192a72bffb8929a4db5c70fa1a0b0c' 
  AND token = 'cXpSpkyY2Pkz5Eos0/iGYijicRr+svE5XJ17z/str6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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