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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63522be8aa31f7dbc215c79a1c54cb03fc63c42d7644d80663c211ad30c55017' 
  AND token = '6SlH2G1Zeb+n6FveANB1kKO076tVa1GaFUZwZ7xjGxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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