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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '400568f30bab5646daa51f6b279a4b5ed4be78130e2f044aa2d853ca119e73ba' 
  AND token = '34j92/Hq4Q0p/stw9yrfSCZINmzyhM0+NPCPtNJ25Kw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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