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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75831f529d1eb22460a06c8da652c6a8885a0fef15cf6fdc63557c1371138f03' 
  AND token = 'DMjy6dMIuPv/5prePKsEQzIh7KHBpudA54t7QUKSCr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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