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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a793c60f61c5f752d8cf7540038d65b7a70d6a34c0ee18bdf27521f73a5c2dcc' 
  AND token = '7IK4RORw2BCYZbi661zbm8qb4VvUzNWus6j/253hp5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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