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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf2d7733ba4d5f4669069ec4cd71129a53075930d277f62eecafe12dc7f84649' 
  AND token = 'k/b7fC2jBsrJvl9s9SrRtG+zBeDM+fKWZKdycMyVdpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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