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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e0e5416607767de6779fdc46f4a9fc25c52658eada783495131ef8d188557e9' 
  AND token = 'P1/wmNWwXRWVs5MtBw8MAdXCe8otWCaKhhurjXVEO2E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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