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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55f766836a7dde1e776ffb19f719f4435015219196571b4ff2408c0023a68d74' 
  AND token = 'epPj3BzXGng7XnfDclgExtkWdBXPAsaLygKi3DAanRo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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