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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bd6ea47410bfa893a5b7ae864ea1ab1c4a8656f26c6b7f7dc6a538bc3210712' 
  AND token = 'MbmnyPqzjKdJFHFWXzOabcEbbjgTjwmnIx8rCjUrI1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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