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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caad36aeb138ef4020986a47fd34b516fd14c2836122a08f2e760f2f5c6f6f82' 
  AND token = 'bKHLEsglj6IdVUYmr53TWkM0ioNbTdvCOBjHQ9HfZS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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