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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2536269ffb4663d0d680ceffce464cebed16252688a0a14a973b3349daf43b2' 
  AND token = 'FLMAuw1KUlID8Z1TNgPhl0Lo1qIueohHPPMVGS4BOyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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