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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f556b7efb242bcb70a811562ea435bd97b0b8a02f34ef2e32f12c935b1ca277d' 
  AND token = 'b7HWXMhJT72+6asIEWMfWgD6rkK0y0vuZKSiUnj4KBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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