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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d138099c1f1dd7ff599c9aa95f71b704d60e8e68ffeb2d3581ed90401f8870f' 
  AND token = 'yWDgLhoN6ysP5t0BQnb9Ql9hYzPly5Rm26pNL4/c+as=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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