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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4238a10c7658ea92bb873da7b3bd7b269a64e2d6fdb41603ec5dd6cb288e624d' 
  AND token = 'o+yWuBDB9e3cMzBfes2xDX7xvQzAan7iApQE2KHt0l0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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