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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93784f35a71f754e91e7adbb43ce0bcf044e59f3711dd7103f56b9f1182429a1' 
  AND token = 'SnCtBLYxAfu6vZHddD0Ti69vBqhmnC7//+bfPvYohSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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