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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70615d779d83e828dc520ff5c5aa4d1771b66f8ecb2825300a5cf29f1a8a29d8' 
  AND token = 'DJ2kg2urlNhYxZxEsv509G0/gzL9E2Swvi3Pns2b4ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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