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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df17e116f0edefe2ac432fe9e1d943f62ea8798c40b27288042f604603bccbc1' 
  AND token = 'uSR5LiZxMDXFynD9Gilno8yWaJxsRh/7Wb8c0eCn5So=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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