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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd69043f2f00f95e97e2027b5953e80095006f77e288a118970572fc280a258a' 
  AND token = '8zH+KGYokrR5r5Zp1igypcbgh0EVZrgpdbqE753vwkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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