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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '402aa561195ef6d3e678fe4062c96bc4ce77322c3af93ae6342b1a1bbf1e61ef' 
  AND token = '5utnKDneHkKSUZPzZ6QrGKLG3gjblv500175stZ5Elw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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