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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9154e450cffd2af0cea5903f816f4ad6eeb6151940aa1e6057ee84c2677b81d5' 
  AND token = 'QzaP1xumKrusIB4b0JJMfUmZZNBvZgecPJZw8xh2SNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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