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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a9530174af502b3df9e1d2b7b8381124306c1f4c4a21eed3001fa8bf9b23f9' 
  AND token = 'q78t+bJKvmKt8KtqRlDcdEL15as3Q3JdLjzNeL68C2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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