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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '685bf31f2873b6e70642c4bea21117560c4ec8bc12f5f662c6f244fa7a9011b5' 
  AND token = 'vQMN7dSVh462cP4yBhl1MwziXfUJ3F1UU6PYK477K48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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