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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '390bcec84a86d71dac770271e0759547cb40bfbcb98aaa544911d21f930a78f0' 
  AND token = 'ALNPh4GRE2joO+8O3YEcqcbTqlIyU68Op6osrfW3WlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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