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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d464ef4867e35101b16731b36b345304f7464edb4c8a33a5e6325b0b550ce1e' 
  AND token = 'hoSeu3qzNTlnwV3o0gHEj+P/xemf/ErytjkQr4fDNck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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