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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9fc0164a967d446e4d482f74ee615f84efb5913c28589790dc91645adda84f8' 
  AND token = '5lgGt0WQ2e6womKRhZSKa5tp8aO+rdPQt4cAmd8AKqQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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