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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fda5197e1ffdc8d28323201fdc1815520a734003106406dee62a480a6f032ac4' 
  AND token = '9UmRte70DEy4x+9JdVNK4DSKpbl+p6HN6nSnXEH9BQw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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