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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fba84013ab881600c82d593364378524b0904ea9d17cca076900e289ea110973' 
  AND token = '4bntFhlV1VshLDr8yq/0/GUjhwvLQfkR5V4B7Ml0P9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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