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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '932f42088b29b6fbd24a975dfa2e4d0597dee4f5238ccc5a301bcb747fe791dc' 
  AND token = '3kmRfD9U+/alSoedFfJm6nal7vgZ2S9f7RFpM2ig004=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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