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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '206bb0ecd163c1dc5b6b3a60a0340372d2c66eb73a6f39b3fd76c4053a3b538b' 
  AND token = '1phkSt4JEgrldz2u1vIVQ9WP/3NW+tewOukExkBc4Xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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