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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '514c3984c4fee01f642a0c7f2a477389694cbbfe1cba0353cd500d8b87cde51a' 
  AND token = 'cwxgO1VcMDgxp6O8JOwF+ycNJo8b6X7QnDTXoEVTCfo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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