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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d75f1ee3f5655e0ab017aecf87d1d3a18c2a4b31ef4178557311a45bec8b0b6' 
  AND token = '2q761eEIgwEH+dneF7QQXGFHFGAGfj/pfflNmhG5cfw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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